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Rel. frost
Last spring frost (0°C) 4 May Frost 9 of 10 years · 20 years of data
Frost-free season 141 days 4 May – 22 Sep
Probability that frost is over

10% = Half of years are frost-free by this date. More about frost & season →

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Vegetables

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Cauliflower
Brassica oleracea (Botrytis-gruppen)
16 – 30 Mar
14 Jun
5-7 wk
4 May
19 Jul
0 wk
8 May
9 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
23 Mar – 6 Apr
26 Jun
4-6 wk
4 May
24 Jul
0 wk
8 May
14 Jul
1 wk after
Chili pepper
Capsicum annuum
Season too short
24 Feb – 24 Mar
8-12 wk
19 May
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
16 – 30 Mar
9 Jun
5-7 wk
4 May
14 Jul
0 wk
4 May
4 Jul
0 wk
Garden cucumber
Cucumis sativus
Season too short
21 – 28 Apr
3-4 wk
19 May
2 wk after
Florence Fennel
Foeniculum vulgare
12 – 19 May
19 May
4-5 wk
16 Jun
16 Jun
6 wk after
22 Jun
7 wk after
Butter bean
Phaseolus lunatus
Season too short
24 – 31 May
3-4 wk
21 Jun
7 wk after
Onion
Allium cepa (Cepa-gruppen)
9 Feb – 9 Mar
22 Mar
8-12 wk
4 May
17 May
0 wk
25 May
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
8 May
6 Jun
1 wk after
8 May
27 May
1 wk after
Maize
Zea mays
Season too short
7 – 14 Apr
3-4 wk
5 May
0 wk
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
14 – 21 Apr
28 Jun
3-4 wk
12 May
19 Jul
1 wk after
25 May
9 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
4 May
4 Jul
0 wk
4 May
24 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
16 – 30 Mar
9 Jun
5-7 wk
4 May
14 Jul
0 wk
4 May
4 Jul
0 wk
Potato
Solanum tuberosum
8 – 22 Apr
21 May
4-6 wk
20 May
18 Jun
2 wk after
20 May
8 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
16 – 30 Mar
19 Jun
5-7 wk
4 May
24 Jul
0 wk
8 May
14 Jul
1 wk after
Pumpkin
Cucurbita pepo
Greenhouse
21 – 28 Apr
17 May
3-4 wk
19 May
7 Jun
2 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
14 – 21 Apr
27 May
3-4 wk
12 May
17 Jun
1 wk after
25 May
7 Jun
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
23 Mar – 6 Apr
21 Jun
4-6 wk
4 May
19 Jul
0 wk
Lettuce
Lactuca sativa
6 – 13 Apr
8 Jul
3-4 wk
4 May
29 Jul
0 wk
8 May
19 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
23 Mar – 6 Apr
21 Jun
4-6 wk
4 May
19 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
6 – 20 Apr
25 May
2-4 wk
4 May
8 Jun
0 wk
4 May
29 May
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
8 May
6 Jun
1 wk after
8 May
27 May
1 wk after
Spinach
Spinacia oleracea
6 – 13 Apr
23 Jul
3-4 wk
4 May
13 Aug
0 wk
30 Apr
3 Aug
1 wk before
Sweet potato
Ipomoea batatas
5 – 19 Jun
4-6 wk
17 Jul
11 wk after
Garden tomato
Solanum lycopersicum
Season too short
10 – 24 Mar
6-8 wk
5 May
0 wk
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Greenhouse
7 – 21 Apr
19 May
2-4 wk
5 May
2 Jun
0 wk
25 May
3 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
23 Mar – 6 Apr
21 Jun
4-6 wk
4 May
19 Jul
0 wk
Garden pea
Pisum sativum
6 – 13 Apr
23 Jun
3-4 wk
4 May
14 Jul
0 wk
8 May
4 Jul
1 wk after

Herbs

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Basil
Ocimum basilicum
Greenhouse
7 – 21 Apr
25 Apr
4-6 wk
19 May
23 May
2 wk after
Lemon balm
Melissa officinalis
23 Feb – 9 Mar
19 May
8-10 wk
4 May
14 Jul
0 wk
8 Jun
4 Jul
5 wk after
Dill
Anethum graveolens
8 May
19 Jul
1 wk after
Wild chives
Allium schoenoprasum
9 – 23 Mar
2 Jun
6-8 wk
4 May
14 Jul
0 wk
8 May
4 Jul
1 wk after
Spearmint
Mentha spicata
9 Feb – 9 Mar
19 May
8-12 wk
4 May
14 Jul
0 wk
8 Jun
4 Jul
5 wk after
Coriander
Coriandrum sativum
4 May
8 Aug
0 wk
25 May
29 Jul
3 wk after
Garden sage
Salvia officinalis
3 – 17 Mar
4 May
8-10 wk
12 May
29 Jun
1 wk after
Common thyme
Thymus vulgaris
23 Feb – 9 Mar
9 May
8-10 wk
4 May
4 Jul
0 wk
Oregano
Origanum vulgare
9 – 23 Mar
23 May
6-8 wk
4 May
4 Jul
0 wk
8 Jun
24 Jun
5 wk after
Parsley
Petroselinum crispum
9 – 23 Mar
23 May
6-8 wk
4 May
4 Jul
0 wk
8 May
24 Jun
1 wk after
Rosemary
Salvia rosmarinus
3 Feb – 3 Mar
23 Mar
10-14 wk
12 May
1 Jun
1 wk after

Annual flowers

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Morning glory
Ipomoea tricolor
Greenhouse
21 – 28 Apr
2 May
3-4 wk
19 May
23 May
2 wk after
Cornflower
Centaurea cyanus
4 May
14 Jul
0 wk
8 May
4 Jul
1 wk after
Statice
Limonium sinuatum
Fleece
10 – 24 Mar
29 Mar
8-10 wk
19 May
24 May
2 wk after
Sweet William
Dianthus barbatus
9 – 23 Mar
6-8 wk
4 May
0 wk
20 May
2 wk after
Snow-on-the-mountain
Euphorbia marginata
Fleece
24 Mar – 7 Apr
12 Apr
6-8 wk
19 May
24 May
2 wk after
2 Jul
8 wk after
Pinnate dahlia
Dahlia × pinnata
Fleece
17 – 31 Mar
26 Apr
6-8 wk
12 May
7 Jun
1 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
13 Apr – 11 May
15 Apr
4-8 wk
8 Jun
5 wk after
8 Jun
5 wk after
Foxglove
Digitalis purpurea
23 Feb – 9 Mar
8-10 wk
4 May
0 wk
25 May
3 wk after
Busy lizzie
Impatiens walleriana
Fleece
8 Mar – 5 Apr
13 May
8-12 wk
31 May
8 Jul
4 wk after
Creeping zinnia
Sanvitalia procumbens
Fleece
24 Mar – 7 Apr
22 Apr
6-8 wk
19 May
3 Jun
2 wk after
Hyacinth bean
Dolichos lablab
Season too short
19 Apr – 3 May
4-6 wk
31 May
4 wk after
Chinese lantern
Physalis alkekengi
3 – 17 Mar
14 Apr
8-10 wk
12 May
9 Jun
1 wk after
Love in a mist
Nigella damascena
4 May
29 Jun
0 wk
8 May
19 Jun
1 wk after
Strawflower
Xerochrysum bracteatum
Fleece
24 Mar – 7 Apr
2 Apr
6-8 wk
19 May
2 wk after
2 Jul
8 wk after
Purple-top vervain
Verbena bonariensis
17 Feb – 17 Mar
14 Apr
8-12 wk
12 May
9 Jun
1 wk after
Cardoon
Cynara cardunculus
Fleece
24 Feb – 24 Mar
20 Mar
8-12 wk
19 May
2 wk after
Regal-foxtail
Ptilotus nobilis
Greenhouse
24 Feb – 24 Mar
18 Mar
8-12 wk
19 May
2 wk after
Globe amaranth
Gomphrena globosa
Greenhouse
24 Mar – 7 Apr
1 Apr
6-8 wk
19 May
2 wk after
Corn poppy
Papaver rhoeas
4 May
14 Jul
0 wk
8 May
4 Jul
1 wk after
Snapdragon
Antirrhinum majus
9 Feb – 9 Mar
9 May
8-12 wk
4 May
4 Jul
0 wk
20 May
24 Jun
2 wk after
Flossflower
Ageratum houstonianum
Fleece
22 Mar – 5 Apr
8 Apr
8-10 wk
31 May
3 Jun
4 wk after
Sweet pea
Lathyrus odoratus
9 – 30 Mar
30 May
5-8 wk
4 May
4 Jul
0 wk
Stock
Matthiola incana
9 – 23 Mar
2 Jun
6-8 wk
4 May
14 Jul
0 wk
25 May
4 Jul
3 wk after
Wormwood
Artemisia absinthium
9 – 23 Mar
3 May
6-8 wk
4 May
14 Jun
0 wk
25 May
4 Jun
3 wk after
Mexican sunflower
Tithonia rotundifolia
Season too short
7 – 21 Apr
10 Apr
4-6 wk
19 May
2 wk after
Garden pansy
Viola × wittrockiana
23 Feb – 9 Mar
19 May
8-10 wk
4 May
14 Jul
0 wk
20 May
4 Jul
2 wk after
Petunia
Petunia
Fleece
24 Feb – 24 Mar
29 Mar
8-12 wk
19 May
24 May
2 wk after
Sweet Scabious
Scabiosa atropurpurea
17 – 31 Mar
28 Apr
6-8 wk
12 May
9 Jun
1 wk after
22 Jun
7 wk after
Common zinnia
Zinnia elegans
Fleece
7 – 21 Apr
25 Apr
4-6 wk
19 May
23 May
2 wk after
Common morning glory
Ipomoea purpurea
Greenhouse
14 – 28 Apr
2 May
3-5 wk
19 May
23 May
2 wk after
Garden cosmos
Cosmos bipinnatus
Fleece
7 – 21 Apr
10 May
4-6 wk
19 May
7 Jun
2 wk after
8 Jun
5 wk after
Scarlet milkweed
Asclepias curassavica
Greenhouse
8 Mar – 5 Apr
17 Apr
8-12 wk
31 May
12 Jun
4 wk after
Bee balm
Monarda didyma
9 Feb – 9 Mar
19 Apr
8-12 wk
4 May
14 Jun
0 wk
8 Jun
5 wk after
Yarrow
Achillea millefolium
9 – 23 Mar
3 Apr
6-8 wk
4 May
15 May
0 wk
25 May
3 wk after
Safflower
Carthamus tinctorius
4 May
14 Jun
0 wk
8 May
4 Jun
1 wk after
Iceland poppy
Papaver nudicaule
Season too short
9 – 23 Mar
23 May
6-8 wk
4 May
4 Jul
0 wk
16 Apr
24 Jun
3 wk before
Bishop's flower
Ammi majus
23 Mar – 6 Apr
6 Jun
4-6 wk
4 May
4 Jul
0 wk
25 May
24 Jun
3 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
24 Feb – 10 Mar
9 Mar
10-12 wk
19 May
2 wk after
Sunflower
Helianthus annuus
3 – 10 May
31 May
3-4 wk
31 May
21 Jun
4 wk after
8 Jun
11 Jun
5 wk after
China aster
Callistephus chinensis
5 – 19 Apr
20 May
6-8 wk
31 May
1 Jul
4 wk after
22 Jun
7 wk after
Annual phlox
Phlox drummondii
Fleece
10 – 24 Mar
22 Apr
6-8 wk
5 May
3 Jun
0 wk
8 Jun
5 wk after
Hollyhock
Alcea rosea
9 – 23 Mar
6-8 wk
4 May
0 wk
25 May
3 wk after
Alpine delphinium
Delphinium elatum
9 Feb – 9 Mar
19 Apr
8-12 wk
4 May
14 Jun
0 wk
8 Jun
5 wk after
African marigold
Tagetes erecta
Fleece
24 Mar – 7 Apr
22 Apr
6-8 wk
19 May
3 Jun
2 wk after
Black-eyed Susan
Rudbeckia hirta
17 – 31 Mar
10 May
6-8 wk
12 May
21 Jun
1 wk after
22 Jun
7 wk after
Wood sage
Salvia nemorosa
23 Feb – 9 Mar
9 Apr
8-10 wk
4 May
4 Jun
0 wk
8 Jun
5 wk after
Black-eyed susan vine
Thunbergia alata
Greenhouse
10 Mar – 7 Apr
11 Apr
6-10 wk
19 May
23 May
2 wk after
California goldenpoppy
Eschscholzia californica
4 May
14 Jul
0 wk
8 May
4 Jul
1 wk after
Painted tongue
Salpiglossis sinuata
22 Mar – 5 Apr
21 Apr
8-10 wk
31 May
16 Jun
4 wk after
Water forget-me-not
Myosotis scorpioides
9 – 23 Mar
3 May
6-8 wk
4 May
14 Jun
0 wk
25 May
4 Jun
3 wk after